linux-kernel - Re: OF-related boot crash in 3.3.0-rc3-00188-g3ec1e88

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Date:	Wed, 22 Feb 2012 18:22:36 +0000
From:	Richard Mortimer <richm@...elvet.org.uk>
To:	Meelis Roos <mroos@...ux.ee>
CC:	Tejun Heo <tj@...nel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	sparclinux@...r.kernel.org,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	sam@...nborg.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: OF-related boot crash in 3.3.0-rc3-00188-g3ec1e88

On 22/02/2012 00:36, Meelis Roos wrote:
>> Meelis, can you please apply the following patch before&  after the
>> offending commit, boot with "memblock=debug" added as kernel param and
>> post the boot log?  The patch will generate some offset warnings after
>> the commit but should work fine.
>
> Before the commit (v3.2-rc3-75-g0ee332c): memblock1.gz (attached)
> After the commit (v3.2-rc3-76-g7bd0b0f): memblock2.gz (attached)
>
Its a long time since I regularly had to worry about SPARC boxes (not) 
booting so may be the difference between virtual & physical addresses 
but I notice that some of the addresses in the register dump have 
non-zero values in the upper 32 bits but the memblock values have zero 
in the upper half.


memblock reserved: ADD [0x0000007fcc0a40-0x0000007fcc0a4e] node 1
memblock reserved: add [0x0000007fcc0a40-000000007fcc0a4e] node 1 @767

But a similar address in the registers has fffff800 in there.

o4: fffff8007fcc0a4d

I know that there are a number of explanations why things would be 
different (32 bit acesses etc) but it could explain things plus we would 
be talking 64 bit addresses in the kernel.

Just a thought.

Richard


> In addition, a third type of sparc machines breaks in a third way - V210
> and V240 just hang after telling
>
> console [tty0] enabled, bootconsole disabled
>
> and before calibrating the delay loop. Bisect has led to the same commit.
>
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